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Title: Study of Pinching Capillary Discharge for Nitrogen H-like Recombination Laser

Abstract

A computer model of EUV nitrogen laser pumped by pinching capillary discharge is presented. The model consists of magneto-hydrodynamics plasma description and subsequent ion kinetic evaluation. Quick changes of electron temperature during the pinch decay lead to ionisation and excitation non-equilibrium and result in inversion population on Balmer alpha transition. Validity of our model was proved via comparison of measured and evaluated spectra of our device with 15.5 kA peak current. High gain lasing system is predicted for 2 mm diam. capillary filled by 0.2 kPa nitrogen if 80 kA peak current and 30 ns pulse duration are taken into account.

Authors:
 [1]; ; ; ;  [2]
  1. Institute of Plasma Physics AS CR, 182 00 Prague 8 (Czech Republic)
  2. Czech Technical University in Prague, 115 19 Prague 1 (Czech Republic)
Publication Date:
OSTI Identifier:
20729264
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 808; Journal Issue: 1; Conference: 6. international conference on dense Z-pinches, Oxford (United Kingdom), 25-28 Jul 2005; Other Information: DOI: 10.1063/1.2159367; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CAPILLARIES; COMPARATIVE EVALUATIONS; ELECTRIC CURRENTS; ELECTRON TEMPERATURE; EMISSION SPECTRA; EXCITATION; GAIN; IONIZATION; IONS; LONGITUDINAL PINCH; MAGNETOHYDRODYNAMICS; NITROGEN; PLASMA; PLASMA SIMULATION; PULSES; RECOMBINATION; X-RAY LASERS

Citation Formats

Vrba, Pavel, Vrbova, Miroslava, Jancarek, Alexandr, Pina, Ladislav, and Havlikova, Radka. Study of Pinching Capillary Discharge for Nitrogen H-like Recombination Laser. United States: N. p., 2006. Web. doi:10.1063/1.2159367.
Vrba, Pavel, Vrbova, Miroslava, Jancarek, Alexandr, Pina, Ladislav, & Havlikova, Radka. Study of Pinching Capillary Discharge for Nitrogen H-like Recombination Laser. United States. doi:10.1063/1.2159367.
Vrba, Pavel, Vrbova, Miroslava, Jancarek, Alexandr, Pina, Ladislav, and Havlikova, Radka. Thu . "Study of Pinching Capillary Discharge for Nitrogen H-like Recombination Laser". United States. doi:10.1063/1.2159367.
@article{osti_20729264,
title = {Study of Pinching Capillary Discharge for Nitrogen H-like Recombination Laser},
author = {Vrba, Pavel and Vrbova, Miroslava and Jancarek, Alexandr and Pina, Ladislav and Havlikova, Radka},
abstractNote = {A computer model of EUV nitrogen laser pumped by pinching capillary discharge is presented. The model consists of magneto-hydrodynamics plasma description and subsequent ion kinetic evaluation. Quick changes of electron temperature during the pinch decay lead to ionisation and excitation non-equilibrium and result in inversion population on Balmer alpha transition. Validity of our model was proved via comparison of measured and evaluated spectra of our device with 15.5 kA peak current. High gain lasing system is predicted for 2 mm diam. capillary filled by 0.2 kPa nitrogen if 80 kA peak current and 30 ns pulse duration are taken into account.},
doi = {10.1063/1.2159367},
journal = {AIP Conference Proceedings},
number = 1,
volume = 808,
place = {United States},
year = {Thu Jan 05 00:00:00 EST 2006},
month = {Thu Jan 05 00:00:00 EST 2006}
}
  • No abstract available.
  • We have performed systematic measurements and numerical modeling of the divergence and exit beam size of a 46.9 nm Ne-like Ar capillary discharge pumped soft-x-ray amplifier. Two-dimensional near-field and far-field measurements were obtained over a wide range of discharge parameters. The spot size and divergence of the laser beam were observed to increase significantly with decreasing discharge pressure. Simultaneously, the beam intensity distribution changed from a single peak pattern to an annular profile. These effects are shown to be the result of increased refraction of the soft-x-ray beam, caused by larger density gradients in the plasma columns of the lowermore » pressure discharges. The spatial images are nearly cylindrically symmetric, and have less structure than those reported in the literature for laser-driven soft-x-ray lasers. Beam profiles synthesized by model calculations are found to be in good agreement with the recorded images. The obtained images in combination with the model computations clarify the origin of the different beam patterns that are observed in capillary discharge soft-x-ray laser experiments. {copyright} {ital 1998} {ital The American Physical Society}« less
  • We report the measurement of the linewidth and temporal coherence of a = 46.9 nm neon-like argon capillary discharge soft x-ray laser and its variation with plasma column length. A wavefront division interferometer was used to resolve the 3p 1S0-3s 1P1 laser line, resulting in a measured relative linewidths of / = 3-4 10 -5. The measurements do not observe saturation re-broadening as this clearly dominantly Doppler-broadened inhomogeneous line is amplified beyond the intensity corresponding to gain saturation. Model simulations indicate that this is the result of comparatively small collisional broadening that homogenizes the line profile to practically eliminate inhomogeneousmore » saturation re-broadening. Collisional re-distribution is computed to only play a minor role in homogenizing the line profile.« less
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